Abstract
A cold moderator using liquid hydrogen is one of the key components in a MW-scale spallation target system, which directly affects the neutronic performance both in intensity and resolution. Flow visualization experiments were carried out in order to clarified a flow field in a cold moderator vessel, the impinging jet induced flows such as recirculation flows and stagnant regions were verified in a moderator vessel. As for a cylindrical moderator vessel, analytical results, such as turbulent energy distribution and heat transfer coefficients, obtained with a non-linear turbulent model predicted experimental results obtained with a PIV system better than those with other turbulent models.
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